US20090223719A1 - Dual string orbital drilling system - Google Patents
Dual string orbital drilling system Download PDFInfo
- Publication number
- US20090223719A1 US20090223719A1 US12/381,019 US38101909A US2009223719A1 US 20090223719 A1 US20090223719 A1 US 20090223719A1 US 38101909 A US38101909 A US 38101909A US 2009223719 A1 US2009223719 A1 US 2009223719A1
- Authority
- US
- United States
- Prior art keywords
- drill string
- string
- tubular
- drill
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 43
- 230000009977 dual effect Effects 0.000 title claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 239000012530 fluid Substances 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/002—Drilling with diversely driven shafts extending into the borehole
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/64—Drill bits characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
Definitions
- the present invention relates to a dual string orbital drilling system for drilling bore holes in earth formations.
- the present invention has significant advantages when drilling through fractured rock.
- Dual wall drilling systems are known.
- U.S. Pat. No. 4,618,172 to Becker shows a dual wall drill pipe having an outer pipe with a drill bit mounted at the drilling end of the outer pipe and an inner pipe used for providing a passageway for returning drilling fluid directed to the drill bit returning the drilling fluid to the surface.
- U.S. Pat. No. 4,940,098 to Moss shows another dual wall drilling system where the inner pipe is used for returning drilling fluid to the surface and a drill bit is mounted at the drilling end of the outer pipe.
- the present invention relates to a dual string drilling system for drilling a well bore in an earth formation, having a rotatable, tubular outer drill string and an upper rotatable, tubular inner drill string concentrically disposed in spaced apart relation with the outer drill string.
- An elongate tubular drill bit is mounted to a distal end of the outer drill string.
- the drill bit mounted to the outer drill string having an interior passageway having a longitudinal axis which is inclined with respect to the longitudinal axis of the outer drill string.
- the drill bit mounted to the outer drill string further provided with a cutaway portion extending through a wall of the tubular outer drill string.
- a lower rotatable inner drill string is coupled to the upper rotatable tubular inner drill string for rotation therewith and is disposed within the interior passageway of the drill bit mounted to the outer drill string.
- a drill bit is mounted to the distal of the lower inner drill string and is sized to extend beyond the drill bit mounted to the outer drill string.
- a passageway is provided for injecting drilling fluid through the tubular inner drill string to the drill bits in the well bore and then returning the drilling fluid through a passageway between the inner drill string and the outer drill string to the surface.
- FIG. 1 is an elevational view of a dual string orbital drilling system according to the present invention
- FIG. 2 is a top view of the drilling system shown in FIG. 1 ;
- FIG. 3 is a cross-sectional view taken along the line 3 - 3 in FIG. 2 ;
- FIG. 4 is a left side elevation view of the drilling system shown in FIG. 1 ;
- FIG. 5 is a perspective view of an upper inner drill string used with the present invention.
- FIG. 6 is an elevational view of the upper inner drill string shown in FIG. 5 ;
- FIG. 7 is a cross-sectional view taken along the line 7 - 7 in FIG. 6 ;
- FIG. 8 is a perspective view of a lower inner drill string assembly used with the present invention.
- FIG. 9 is an elevational view of the lower inner drill string assembly shown in FIG. 8 ;
- FIG. 10 is a cross-sectional view taken along the line 10 - 10 in FIG. 9 ;
- FIG. 11 is a detailed perspective view of the upper inner drill string and lower inner drill string assembly connected together;
- FIG. 12 is an elevational view of the upper inner drill string and lower inner drill string shown in FIG. 11 ;
- FIG. 13 is a cross-sectional view taken along the line 13 - 13 in FIG. 12 ;
- FIG. 14 is a detail view taken at A in FIG. 11 ;
- FIG. 15 is a detail view taken at C in FIG. 13 .
- FIGS. 1-3 A dual string orbital drilling system 10 is shown in FIGS. 1-3 .
- the drilling system 10 includes a tubular outer string 12 and an upper tubular inner string 14 .
- Each of the drill strings 12 and 14 are connected to a drilling rig (not shown) located above the surface of the earth for rotating the drill strings independently of one another.
- the outer string 12 is provided with an elongate outer string drill bit 16 in which carbide buttons 18 are mounted for drilling a bore hole.
- the upper inner drill string 14 is concentrically positioned inside the outer drill string 12 .
- the inner drill string 14 has an interior passageway 21 and the inner drill string 14 has an outside diameter smaller than the inside diameter of the outer drill string 12 , leaving a passageway 20 between the inner string 14 and the outer string 12 .
- a chain sprocket 22 is formed on the outside wall of inner string 14 as shown in FIGS. 3 and 5 - 7 .
- a lower inner drill string assembly 24 is positioned below the upper inner drill string 14 as shown in FIG. 3 .
- the lower inner drill string assembly 24 is provided with a chain sprocket 26 as shown in FIGS. 3 and 8 - 10 .
- a conventional roller chain flexible coupling 28 is wrapped around sprockets 22 and 26 and is used to couple the upper inner drill string 14 and the lower inner drill string assembly 24 together as shown in FIG. 3 and FIG. 11-15 so that the upper inner drill string 14 and lower inner drill string assembly 24 rotate together.
- the lower inner drill string assembly 24 has an interior passageway 25 in fluid communication with the passageway 21 of the inner drill string 14 as shown in FIG. 13 .
- An inner bit 30 is attached at the bottom end of the lower inner drill string assembly 24 as shown in FIG. 3 with the inner bit 30 extending beyond the outer string drill bit 16 .
- bit 30 may be a conventional polycrystalline diamond bit.
- the inner bit 30 includes openings 31 in fluid communication with the passageway 25 as shown in FIGS. 3 and 4 .
- the outside diameter of the inner bit 30 is larger than the outside diameter of the lower inner string assembly 24 providing a shoulder 32 as shown in FIGS. 3 and 13 .
- the lower inner drill string assembly 24 is provided with a shoulder 34 in spaced apart relation with the shoulder 32 as shown in FIG. 3 and 15 .
- a sleeve bearing 36 is positioned in surrounding relation to the lower inner drill string assembly 24 and is sized to fit between the shoulders 32 and 34 . Thus, the sleeve bearing 36 and inner drill string 24 are restricted from moving outwardly with respect to the outer drill string 12 .
- the outer string bit 16 is provided with an internal, inclined, off-center bore 38 as shown in FIG. 3 .
- the outer string bit 16 is also provided with a cutaway portion 40 as shown in FIG. 1 .
- the lower inner drill string assembly 24 with sleeve bearing 36 is fitted within the off-center bore 38 and extends out through cutaway portion 40 as shown in FIG. 3 . With this construction, as the outer string 12 is rotated, the inner bit 30 orbits around the center line of the outer string 12 during the drilling operation.
- Drilling fluid may be injected to the inner bit 30 through the passageways 21 and 25 . Drilling fluid is then injected through opening 31 into the bore hole surrounding bits 30 and 16 .
- the outer drill string 12 is provided with cutouts 42 as shown in FIGS. 1-3 . Drilling fluid is then forced under pressure to move upwards to the earth's surface in the bore hole outside the outer drill string 12 , through cutouts 42 and then upwardly in the passageway 20 .
- the inner string rotates at a faster rate than the outer string and the outer string can be rotated either in the same direction or in opposite direction as the direction of rotation of the inner string.
- the inner bit and the inner drill string can be removed from the outer drill string without removing the outer bit and outer drill string.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
Description
- This application claims the benefit of provisional application Ser. No. 61/068,383 filed Mar. 6, 2008.
- The present invention relates to a dual string orbital drilling system for drilling bore holes in earth formations. The present invention has significant advantages when drilling through fractured rock.
- Generally bore holes are formed by rotating a drill string which may be several hundred feet in length into an earth formation. Dual wall drilling systems are known. For example, U.S. Pat. No. 4,618,172 to Becker shows a dual wall drill pipe having an outer pipe with a drill bit mounted at the drilling end of the outer pipe and an inner pipe used for providing a passageway for returning drilling fluid directed to the drill bit returning the drilling fluid to the surface. U.S. Pat. No. 4,940,098 to Moss shows another dual wall drilling system where the inner pipe is used for returning drilling fluid to the surface and a drill bit is mounted at the drilling end of the outer pipe.
- A need exists, however, for a dual string drilling system where both the outer drilling string and an inner drilling string are used together to drill a bore hole.
- A need also exists for a drilling system which allows an inner drilling string to perform drilling operations while being supported by an outer drill string which then allows the outer drill string and the inner drill string to be of reduced diameter thereby enabling a user to use the drilling system for drilling small holes approximately 3″ in diameter for long depths such as 10,000 feet.
- The present invention relates to a dual string drilling system for drilling a well bore in an earth formation, having a rotatable, tubular outer drill string and an upper rotatable, tubular inner drill string concentrically disposed in spaced apart relation with the outer drill string. An elongate tubular drill bit is mounted to a distal end of the outer drill string. The drill bit mounted to the outer drill string having an interior passageway having a longitudinal axis which is inclined with respect to the longitudinal axis of the outer drill string. The drill bit mounted to the outer drill string further provided with a cutaway portion extending through a wall of the tubular outer drill string. A lower rotatable inner drill string is coupled to the upper rotatable tubular inner drill string for rotation therewith and is disposed within the interior passageway of the drill bit mounted to the outer drill string. A drill bit is mounted to the distal of the lower inner drill string and is sized to extend beyond the drill bit mounted to the outer drill string. A passageway is provided for injecting drilling fluid through the tubular inner drill string to the drill bits in the well bore and then returning the drilling fluid through a passageway between the inner drill string and the outer drill string to the surface. With this arrangement, the lower inner drill string and the outer drill string both perform drilling operations.
- In order that the invention may be clearly understood and readily carried into effect, a preferred embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings wherein:
-
FIG. 1 is an elevational view of a dual string orbital drilling system according to the present invention; -
FIG. 2 is a top view of the drilling system shown inFIG. 1 ; -
FIG. 3 is a cross-sectional view taken along the line 3-3 inFIG. 2 ; -
FIG. 4 is a left side elevation view of the drilling system shown inFIG. 1 ; -
FIG. 5 is a perspective view of an upper inner drill string used with the present invention; -
FIG. 6 is an elevational view of the upper inner drill string shown inFIG. 5 ; -
FIG. 7 is a cross-sectional view taken along the line 7-7 inFIG. 6 ; -
FIG. 8 is a perspective view of a lower inner drill string assembly used with the present invention; -
FIG. 9 is an elevational view of the lower inner drill string assembly shown inFIG. 8 ; -
FIG. 10 is a cross-sectional view taken along the line 10-10 inFIG. 9 ; -
FIG. 11 is a detailed perspective view of the upper inner drill string and lower inner drill string assembly connected together; -
FIG. 12 is an elevational view of the upper inner drill string and lower inner drill string shown inFIG. 11 ; -
FIG. 13 is a cross-sectional view taken along the line 13-13 inFIG. 12 ; -
FIG. 14 is a detail view taken at A inFIG. 11 ; and -
FIG. 15 is a detail view taken at C inFIG. 13 . - A dual string
orbital drilling system 10 is shown inFIGS. 1-3 . Thedrilling system 10 includes a tubularouter string 12 and an upper tubularinner string 14. Each of thedrill strings - The
outer string 12 is provided with an elongate outerstring drill bit 16 in whichcarbide buttons 18 are mounted for drilling a bore hole. - The upper
inner drill string 14 is concentrically positioned inside theouter drill string 12. Theinner drill string 14 has aninterior passageway 21 and theinner drill string 14 has an outside diameter smaller than the inside diameter of theouter drill string 12, leaving apassageway 20 between theinner string 14 and theouter string 12. At the lower end of upperinner string 14, achain sprocket 22 is formed on the outside wall ofinner string 14 as shown in FIGS. 3 and 5-7. - A lower inner
drill string assembly 24 is positioned below the upperinner drill string 14 as shown inFIG. 3 . The lower innerdrill string assembly 24 is provided with achain sprocket 26 as shown in FIGS. 3 and 8-10. A conventional roller chainflexible coupling 28 is wrapped aroundsprockets inner drill string 14 and the lower innerdrill string assembly 24 together as shown inFIG. 3 andFIG. 11-15 so that the upperinner drill string 14 and lower innerdrill string assembly 24 rotate together. The lower innerdrill string assembly 24 has aninterior passageway 25 in fluid communication with thepassageway 21 of theinner drill string 14 as shown inFIG. 13 . - An
inner bit 30 is attached at the bottom end of the lower innerdrill string assembly 24 as shown inFIG. 3 with theinner bit 30 extending beyond the outerstring drill bit 16. In a preferred embodiment,bit 30 may be a conventional polycrystalline diamond bit. Theinner bit 30 includesopenings 31 in fluid communication with thepassageway 25 as shown inFIGS. 3 and 4 . The outside diameter of theinner bit 30 is larger than the outside diameter of the lowerinner string assembly 24 providing ashoulder 32 as shown inFIGS. 3 and 13 . Further, the lower innerdrill string assembly 24 is provided with ashoulder 34 in spaced apart relation with theshoulder 32 as shown inFIG. 3 and 15 . A sleeve bearing 36 is positioned in surrounding relation to the lower innerdrill string assembly 24 and is sized to fit between theshoulders inner drill string 24 are restricted from moving outwardly with respect to theouter drill string 12. - The
outer string bit 16 is provided with an internal, inclined, off-center bore 38 as shown inFIG. 3 . Theouter string bit 16 is also provided with acutaway portion 40 as shown inFIG. 1 . The lower innerdrill string assembly 24 with sleeve bearing 36 is fitted within the off-center bore 38 and extends out throughcutaway portion 40 as shown inFIG. 3 . With this construction, as theouter string 12 is rotated, theinner bit 30 orbits around the center line of theouter string 12 during the drilling operation. - Drilling fluid may be injected to the
inner bit 30 through thepassageways hole surrounding bits outer drill string 12 is provided withcutouts 42 as shown inFIGS. 1-3 . Drilling fluid is then forced under pressure to move upwards to the earth's surface in the bore hole outside theouter drill string 12, throughcutouts 42 and then upwardly in thepassageway 20. - In a preferred embodiment, the inner string rotates at a faster rate than the outer string and the outer string can be rotated either in the same direction or in opposite direction as the direction of rotation of the inner string.
- As can be seen, the inner bit and the inner drill string can be removed from the outer drill string without removing the outer bit and outer drill string.
- While the fundamental novel features of the invention have been shown and described, it should be understood that various substitutions, modifications, and variations may be made by those skilled in the arts, without departing from the spirit or scope of the invention. Accordingly, all such modifications or variations are included in the scope of the invention as defined by the following claims:
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/381,019 US7896108B2 (en) | 2008-03-06 | 2009-03-06 | Dual string orbital drilling system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US6838308P | 2008-03-06 | 2008-03-06 | |
US12/381,019 US7896108B2 (en) | 2008-03-06 | 2009-03-06 | Dual string orbital drilling system |
Publications (2)
Publication Number | Publication Date |
---|---|
US20090223719A1 true US20090223719A1 (en) | 2009-09-10 |
US7896108B2 US7896108B2 (en) | 2011-03-01 |
Family
ID=41052433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/381,019 Expired - Fee Related US7896108B2 (en) | 2008-03-06 | 2009-03-06 | Dual string orbital drilling system |
Country Status (2)
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US (1) | US7896108B2 (en) |
CA (1) | CA2658134C (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013070479A1 (en) * | 2011-11-11 | 2013-05-16 | Baker Hughes Incorporated | Drilling apparatus including milling devices configured to rotate at different speeds |
US20130292179A1 (en) * | 2012-02-28 | 2013-11-07 | Eurodrill Gmbh | Drive device and method for driving a drill rod |
CN114059970A (en) * | 2021-11-16 | 2022-02-18 | 吉林大学 | Bidirectional rotary multifunctional experiment platform with vibration function |
WO2023000649A1 (en) * | 2021-07-19 | 2023-01-26 | 万晓跃 | Dual pipe |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110214919A1 (en) * | 2010-03-05 | 2011-09-08 | Mcclung Iii Guy L | Dual top drive systems and methods |
US9010410B2 (en) | 2011-11-08 | 2015-04-21 | Max Jerald Story | Top drive systems and methods |
US8739902B2 (en) | 2012-08-07 | 2014-06-03 | Dura Drilling, Inc. | High-speed triple string drilling system |
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US3565190A (en) * | 1968-03-07 | 1971-02-23 | Sanwa Kizai Co Ltd | Auger-type boring machines |
US3963076A (en) * | 1975-03-07 | 1976-06-15 | Baker Oil Tools, Inc. | Method and apparatus for gravel packing well bores |
US3970335A (en) * | 1973-08-29 | 1976-07-20 | Bakerdrill, Inc. | Dual concentric pipes |
US4618172A (en) * | 1982-02-24 | 1986-10-21 | Becker Floyd W | Dual-wall drill pipe |
US4691790A (en) * | 1984-10-16 | 1987-09-08 | Flowdril Corporation | Method and apparatus for removing the inner conduit from a dual passage drill string |
US4844182A (en) * | 1988-06-07 | 1989-07-04 | Mobil Oil Corporation | Method for improving drill cuttings transport from a wellbore |
US4913466A (en) * | 1987-07-20 | 1990-04-03 | Drill Systems International Ltd. | Inner pipe member for dual-wall drill pipe assembly |
US4940098A (en) * | 1989-05-26 | 1990-07-10 | Moss Daniel H | Reverse circulation drill rod |
US5186266A (en) * | 1991-02-15 | 1993-02-16 | Heller Marion E | Multi-walled drill string for exploration-sampling drilling systems |
US5862866A (en) * | 1994-05-25 | 1999-01-26 | Roxwell International Limited | Double walled insulated tubing and method of installing same |
US6015015A (en) * | 1995-06-20 | 2000-01-18 | Bj Services Company U.S.A. | Insulated and/or concentric coiled tubing |
US6065550A (en) * | 1996-02-01 | 2000-05-23 | Gardes; Robert | Method and system for drilling and completing underbalanced multilateral wells utilizing a dual string technique in a live well |
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US20030132034A1 (en) * | 2002-01-15 | 2003-07-17 | The Charles Machine Works, Inc. | Using a rotating inner member to drive a tool in a hollow outer member |
US20030141111A1 (en) * | 2000-08-01 | 2003-07-31 | Giancarlo Pia | Drilling method |
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US6827158B1 (en) * | 2002-07-31 | 2004-12-07 | The Charles Machine Works, Inc. | Two-pipe on-grade directional boring tool and method |
US20050167158A1 (en) * | 2002-09-26 | 2005-08-04 | Halliburton Energy Services, Inc. | One-step directional coring or drilling system |
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WO2006014417A2 (en) | 2004-07-06 | 2006-02-09 | The Charles Machine Works, Inc. | Coiled tubing with dual member drill string |
-
2009
- 2009-03-06 US US12/381,019 patent/US7896108B2/en not_active Expired - Fee Related
- 2009-03-06 CA CA2658134A patent/CA2658134C/en active Active
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US3565190A (en) * | 1968-03-07 | 1971-02-23 | Sanwa Kizai Co Ltd | Auger-type boring machines |
US3970335A (en) * | 1973-08-29 | 1976-07-20 | Bakerdrill, Inc. | Dual concentric pipes |
US3963076A (en) * | 1975-03-07 | 1976-06-15 | Baker Oil Tools, Inc. | Method and apparatus for gravel packing well bores |
US4618172A (en) * | 1982-02-24 | 1986-10-21 | Becker Floyd W | Dual-wall drill pipe |
US4691790A (en) * | 1984-10-16 | 1987-09-08 | Flowdril Corporation | Method and apparatus for removing the inner conduit from a dual passage drill string |
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US6761231B1 (en) * | 2002-05-06 | 2004-07-13 | The Charles Machines Works, Inc. | Rotary driven drilling hammer |
US6827158B1 (en) * | 2002-07-31 | 2004-12-07 | The Charles Machine Works, Inc. | Two-pipe on-grade directional boring tool and method |
US20050167158A1 (en) * | 2002-09-26 | 2005-08-04 | Halliburton Energy Services, Inc. | One-step directional coring or drilling system |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013070479A1 (en) * | 2011-11-11 | 2013-05-16 | Baker Hughes Incorporated | Drilling apparatus including milling devices configured to rotate at different speeds |
US20130292179A1 (en) * | 2012-02-28 | 2013-11-07 | Eurodrill Gmbh | Drive device and method for driving a drill rod |
WO2023000649A1 (en) * | 2021-07-19 | 2023-01-26 | 万晓跃 | Dual pipe |
CN114059970A (en) * | 2021-11-16 | 2022-02-18 | 吉林大学 | Bidirectional rotary multifunctional experiment platform with vibration function |
Also Published As
Publication number | Publication date |
---|---|
CA2658134A1 (en) | 2009-09-06 |
CA2658134C (en) | 2013-08-06 |
US7896108B2 (en) | 2011-03-01 |
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